Spatial Distribution and Risk Assessment of Heavy Metals in Soils from a Typical Urbanized Area

被引：4

作者：

He B. ^{[1
,2
]}

Zhao H. ^{[1
,2
]}

Wang T.-Y. ^{[1
,2
]}

Meng J. ^{[1
]}

Xiao R.-B. ^{[3
]}

Liu S.-R. ^{[1
]}

Zhou Y.-Q. ^{[1
,2
]}

Shi B. ^{[1
]}

机构：

[1] State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing

[2] University of Chinese Academy of Sciences, Beijing

[3] School of Environment Science and Engineering, Guangdong University of Technology, Guangzhou

来源：

Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 06期

关键词：

Heavy metals; Management measures; Risk assessment; Soil quality; Spatial distribution;

D O I：

10.13227/j.hjkx.201810057

中图分类号：

学科分类号：

摘要：

With the rapid urbanization in China, soil environments are facing high risks. Taking a typical urbanized area as a case study, a total of 106 surface soil samples (0-20 cm) and 96 subsurface soil samples (20-40 cm) were collected to determine the concentrations of heavy metals, and then, the Nemerow index and Hankson index methods were used to evaluate their degrees of ecological risk. The spatial distributions of ecological risks were also explored. Experimental results showed that the concentrations of Cr, Ni, Cu, Zn, As, Cd, Pb, and Hg in surface soil samples were 2.87-84.64, 1.40-56.00, 2.75-125.05, 15.05-201.39, 1.46-89.92, 0.001-0.92, 15.29-160.07, and 0.006-0.52 mg•kg-1, respectively, and those in subsurface soil samples were 3.56-75.14, 1.65-71.58, 3.28-290.04, 17.99-296.94, 3.07-65.67, 0.02-1.00, 11.10-97.59, and 0.01-0.41 mg•kg-1, respectively. According to the risk control standards for soil contamination of agricultural land, approximately 71.70%, 40.57%, 4.72%, 3.77%, and 0.94% of Cd, Cu, Pb, As, and Zn, respectively, in the surface soil samples exceeded the standards, while 72.92%, 39.58%, 6.25%, 3.13%, 3.13%, and 1.04% of Cd, Cu, As, Zn, Pb, and Ni, respectively, in the subsurface soil samples exceeded the standards. Obviously, the pollution by Cd and Cu was the most severe in the research area, and the main contaminated areas were distributed in the northern part of the land. The soil environmental quality pollution assessment illustrated that high risk areas were distributed in the northern part of the research area too. The risk assessment results indicated that the main pollution factor was Cd, which is accordance with the serious pollution findings for Cd. In response to these results, effective management and remediation methods should be taken to control the soil environment pollution in this typical urbanized area. © 2019, Science Press. All right reserved.

引用

页码：2869 / 2876

页数：7

共 25 条

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